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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f605032b056a1aa19530d5307a7cce5185a21178920153748de9716f2da7ed88' 
  AND token = 'jAB4JclRzn14k9gHy6oNEb1V50ttZ5juIF/GW8S8F1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}